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In what could be interpreted as a tacit admission that their previous ruling in Bilski last year was about as clear as mud, the Supreme Court has decided to take up another case concerning the validity of a patent claim "that covers observed correlations between blood test results and patient health, so that the claim effectively preempts all uses of the naturally occurring correlations, simply because well-known methods used to administer prescription drugs and test blood may involve 'transformations' of body chemistry."